JPH08261858A - Torque transducer measuring apparatus - Google Patents

Abstract

PURPOSE: To provide a torque transducer measuring apparatus by which a torque ia measured precisely, whose operating efficiency is increased and by which a hysteresis difference can be measured simply. CONSTITUTION: A torque transducer measuring apparatus is constituted of a main shaft 3 which is shaft-supported by a head stock 7, of a torque transducer one end of which is fixed to the main shaft 3 and the other end of which is fixed to a support base and of a variable torque generation means 45 which is composed of a movement means 4 and a weight 5 which are fixed to the other end of the main shaft 3. The movement 4 comprises a ball screw, a pulse motor 10 and an encoder 11, and it moves the weight 5 to the direction of the axial center of the ball screw.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a torque transducer measuring device for measuring the torque performance and hysteresis difference of a torque transducer used in a nut runner or the like.

[0002]

2. Description of the Related Art Generally, a torque transducer is used for a nut runner or the like, and when a large number of screws are assembled into parts, they are always tightened with a constant torque so that the force of the screws does not vary. Therefore, the performance of the torque transducer is a major factor in maintaining the quality of the parts.

In particular, the performance of the torque transducer is
In addition to the accuracy of the generated torque, it depends on the situation of the hysteresis difference (difference between measuring instruments caused by the history of measurement).

Therefore, in measuring the torque transducer, it is important to measure the torque and the hysteresis difference.

In the conventional torque transducer measuring device, as shown in FIG. 5, a spindle 30 is pivotally supported by a spindle stock 70, and a torque transducer 20 supported by a support plate is fixed to one end of the spindle.

On the other hand, a long bar 80 is attached to the other end of the main shaft 30 at its central portion, and the bar has a plurality of small holes formed at appropriate intervals. A hook for hanging the weight 50 is hung on the small hole.

Then, the positions of the weight and the hole are determined according to the torque, the hook is hooked in the set hole, and the weight is sequentially placed.
Then, it is compared whether the torque calculated in advance and the torque actually measured match.

[0008]

However, since the conventional torque transducer measuring device is a system in which the weights are sequentially placed on the hooks hung in the holes of the bar, it is possible to measure the hysteresis difference which needs to be continuously measured. Is not suitable. In other words, in this method, the weight has to be removed from the hook or mounted on the hook each time, so the bar is difficult to stabilize due to vibration at that time, and accurate measurement cannot be performed. If you want to make an accurate measurement, you have to wait until the bar stabilizes, which is very time consuming. In addition, an instantaneous moment is applied at each vibration to shorten the life of the torque transducer. Further, since the holes drilled in the bar are opened at regular intervals, the positions of the holes are limited and the torque cannot be variably measured. Moreover, since the position accuracy is not accurate, the accuracy of the measurement itself is also deteriorated.

The present invention is intended to solve the above-mentioned problems and to perform accurate measurement and variable measurement of torque, improve work efficiency, and perform continuous measurement such that hysteresis difference can be measured. An object of the present invention is to provide a torque transducer measuring device that can perform the measurement.

[0010]

In a torque transducer measuring device according to the present invention, a spindle supported by a spindle stock, and a torque transducer having one end fixed to the spindle and the other end fixed to a support plate. , A variable torque generating means attached to the other end of the main shaft and having a moving means for moving a weight for torque generation.

It is further preferable that the moving means has a ball screw, a pulse motor for driving the ball screw, and an encoder for detecting the position of the weight.

[0012]

In the torque transducer measuring device according to the first aspect of the present invention, the torque transducer is fixed to one of the main shafts supported by the headstock and the weight for generating torque is moved to the other of the main shafts. It is fixed to. Then, the weight can be freely moved in the left-right direction about the main axis by the moving means. Therefore, it is possible to immediately move to the required position with respect to the required set torque, the torque can be variably measured, and the measurement work efficiency is significantly improved. Also, the hysteresis difference can be easily measured.

According to another aspect of the torque transducer measuring device of the present invention, the ball screw is supported by the bracket fixed to the main shaft, and the weight movement guide is fixed.

A weight is placed on a weight support plate which is screwed to the ball screw and guided by the movement guide. When the ball screw is driven by a pulse motor, the weight can move in the left-right direction by the rotation of the ball screw.
Further, the position of the weight can be detected by the encoder.

Therefore, the measurement work efficiency is improved and accurate measurement can be performed.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows the outline of a torque transducer measuring device. A torque transducer 2 is connected to a spindle 3 supported by a headstock 7, and the spindle 3 comprises a moving means 4 and a weight 5. It is connected to the variable torque generating means 45. The movement means 4 moves the weight 5 in the left-right direction.

This will be described in detail with reference to FIGS.
As shown in FIG. 2, the torque transducer 2 is affixed at symmetrical positions to the flange portions 21 and 22 having cylindrical end surfaces, a cylindrical central portion 23, and the outer periphery of the central portion 23. It is composed of two strain gauges 24, 24.

As shown in FIGS. 3 and 4, in the torque transducer measuring device 1, a support plate 6 is fixed on a base, and the torque transducer 2 is fixed to the support plate 6 by bolts. On the other hand, the headstock 7 is fixed on the base, and the headstock 3 is pivotally supported by the headstock 7. One end of the main shaft 3 is fixed to the torque transducer 2 fixed to the support plate 6 via a bolt.

At the other end of the main shaft 3, a long bracket 8 is fixed in the left-right direction in FIG. 4 via bolts. A ball screw is supported by both ends of the bracket 8 on the long side, and one end of the ball screw 9 is connected to the pulse motor 10 and the other end is connected to the encoder 11.

A display (not shown) is connected to the encoder 11, and the position of the weight can be displayed by counting the number of pulses. The pulse motor is connected to an operation panel (not shown).

On the upper surface of the bracket 8, the bracket 8
A weight movement guide 12 having substantially the same length as that of the bracket 8 is fixed in parallel with the ball screw 9 in the longitudinal direction. Further, a "U" -shaped weight support base 13 screwed to the ball screw 9 and movably fitted to the weight movement guide 12 is provided, and the weight 5 is placed on the upper surface of the weight support base 13. There is.

In the moving means 4, a weight corresponding to the difference in weight between the pulse motor and the encoder is attached to the bracket in order to balance the left and right weights about the main shaft.

Next, the measuring method will be described.

First, the required torque is set. For example, 15
When measuring the torque of kgcm, the 5kg weight is placed on the weight support, the moving amount of 3cm is input in advance, and the operation button of the operation panel is pressed. The pulse motor 10 is driven by the button operation, the ball screw 9 rotates, and the weight 5 moves the weight movement guide 1
2 is moved to the left in FIG. When the display connected to the encoder 11 displays 3 cm, it stops at that position.

Then, the bracket 8 tries to rotate counterclockwise around the main shaft 3, so that a torque of 15 kgcm is generated. Since the torque transducer 2 is fixed to the support plate 6 and the main shaft 3, the generated torque is output in a strain amount by the strain gauge 24 attached to the torque transducer 2. The output strain amount is converted and the actual torque is displayed. In this case, a numerical value of 15 kgcm is displayed.

In the above case, if the weight is 15 kg, the movement amount is 1 cm, and if the weight is 3 kg, the movement amount is 5 cm. In either case, the amount of movement can be easily set according to the weight of the weight.

Further, it is necessary to rotate the bracket in the clockwise direction around the main shaft 3 to generate torque in the opposite direction to the measurement. Even in that case, the pulse motor 10 is driven and the ball screw 9 is rotated, so that the measurement can be performed immediately.

Further, even when measuring various torques,
The weight may be fixed and the position of the weight may be variably moved.

When measuring the hysteresis difference, for example, when measuring 15 kgcm, a 5 kg weight is moved to the left side in FIG. Next, once return to the original position (position of 0), move again to the position of 3 cm on the left side. Repeat this several times in succession. This allows the hysteresis difference to be measured. If this difference is within 0% or 1%, it is determined to be good. This operation is of course as described above.

Therefore, it is extremely easy to set an arbitrary torque and measure continuous torque.

The pulse motor, the encoder and the ball screw constituting the moving means can be changed as long as they have equivalent functions.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a torque transducer measuring device according to an embodiment of the present invention.

FIG. 2 is a perspective view of a torque transducer.

FIG. 3 is a sectional view of a torque transducer measuring device.

FIG. 4 is a rear view of the torque transducer measuring device.

FIG. 5 is a schematic diagram of the prior art.

[Explanation of symbols]

 1 ... Torque transducer measuring device 2 ... Torque transducer 3 ... Spindle 4 ... Moving means 5 ... Weight 6 ... Support plate 7 ... Spindle base 9 ... Ball screw 10 ... Pulse motor 11 ... Encoder 45 ... Variable torque generating means

Claims (2)

[Claims] 1. A spindle having a spindle supported by a spindle stock, a torque transducer having one end fixed to the spindle and the other end fixed to a support plate, and a moving means for moving a weight for generating torque. A torque transducer measuring device comprising: a variable torque generating means attached to the other end of the main shaft. 2. The moving means has a ball screw, a pulse motor for driving the ball screw, and an encoder for detecting the position of the weight.
The described torque transducer measuring device.